<!DOCTYPE html>
<html>
<head>
    <title>Test Document</title>
</head>
<body>
    <div id="content">
        <h1 id="section1">Section 1</h1>
        <p>Content for section 1</p>
        <h2 id="section1-1">Section 1.1</h2>
        <p>Content for section 1.1</p>
        <h3 id="section1-1-1">Section 1.1.1</h3>
        <p>Content for section 1.1.1</p>
        <h2 id="section1-2">Section 1.2</h2>
        <p>Content for section 1.2</p>
        <h1 id="section2">Section 2</h1>
        <p>Content for section 2</p>
        <h2 id="section2-1">Section 2.1</h2>
        <p>Content for section 2.1</p>
    </div>
</body>
</html>
